收缩，开裂和变形 –混凝土结构使用的可靠性里

资料简介：

　　Shrinkage, Cracking and Deflection-the Serviceability of Concrete Structures
　　R.I. Gilbert
* w6 H  G* W/ t) u6 j& r( b& b　　Professor and Head, School of Civil and Environmental EngineeringThe University of New South Wales, Sydney, NSW, 2052Email: i.gilbert@unsw.edu.au
　　Abstract
　　This paper addresses the effects of shrinkage on the serviceability of concrete structures.  It outlines why shrinkage is important, its major influence on the final extent of cracking and the magnitude of deflection in structures, and what to do about it in design.  A model is presented for predicting the shrinkage strain in normal and high strength concrete and the time-dependent behaviour of plain concrete and reinforced concrete, with and without external restraints, is explained.  Analytical procedures are described for estimating the final width and spacing of both flexural cracks and direct tension cracks and a simplified procedure is presented for including the effects of shrinkage when calculating long-term deflection.  The paper also contains an overview of the considerations currently being made by the working group established by Standards Australia to revise the serviceability provisions of AS3600-1994, particularly those clauses related to shrinkage.
+ ^6 E8 W3 E' U8 X) |$ g% q　　Keywords
　　Creep; Cracking; Deflection; Reinforced concrete; Serviceability; Shrinkage.
4 u9 l4 A! d% p# S$ A2 O- ^* a　　收缩，开裂和变形 –混凝土结构使用的可靠性里吉尔伯特
　　土木及环境工程学校校长兼教授
0 t# b1 ^$ B' |6 _: g7 U' y　　新南威尔士大学，悉尼，新南威尔士州 2052 号电子邮件： i.gilbert @ unsw.edu.au
　　摘要
　　本文讨论收缩对混凝土结构可靠性的影响，它概述了为什么收缩是重要的，它的主要影响，即对结构最终的开裂程度和挠度大小的影响，以及在设计中应该注意什么？有一种模型可以预测在普通混凝土、高强度混凝土、不稳定性普通混凝土和钢筋混凝土中的收缩应变，无论有没有外部约束的情况下，都可以用这种模型来解释。描述解析过程是为了估算弯曲裂缝及直接拉伸裂缝的最终宽度和间隔，并呈现出一个简化的过程，它包括影当计算长期收缩时的影响。该文件还包含一个概要的注意事项，目前正在由澳大利亚国家标准工作组制定，以校正混凝土使用可靠性条款AS3600-1994尤其是那些涉及到收缩的条款。
% w! x9 P) S9 Q" X. b! c9 d　　关键词
　　徐变;开裂;变形;钢筋混凝土;可靠性;收缩。
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